The number 18442
18442 is a composite number with 4 divisors. Its prime factorisation is 2 × 9221. Divisors (4): 1, 2, 9221, 18442.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18442: a semiprime: 2 × 9221, the product of two primes.
- 2
18442 is composite. Its prime factorisation is
- 3
The divisors add up to 27666; without 18442 itself that is 9224, so 18442 is deficient (9224 is less than 18442). Euler's totient φ(18442) = 9220 numbers up to 18442 share no factor with it.
- 4
The digits of 18442 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 110 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18442 = 2 \times 9221 \]
18442 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 27666 |
| Euler totient φ(n) | 9220 |
| Square | 340107364 |
| Cube | 6272260006888 |
| Square root | 135.801325 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 110 |
| Scientific notation | 1.8442 × |
18442 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand four hundred and forty-two |
| Binary (base 2) | 100100000001010 |
| Octal (base 8) | 44012 |
| Hexadecimal (base 16) | 480A |
| Base 3 | 221022001 |
| As time | 18442 seconds = 5 h 7 min 22 s |
Is 18442 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (18442 ÷ 2 = 9221) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18442 a prime number?
No. 18442 = 2 × 9221, so it is divisible by 2.
What are the factors of 18442?
1, 2, 9221, 18442.
What is 18442 in binary?
100100000001010 (hexadecimal 480A, octal 44012).
What is the square root of 18442?
About 135.8013.
Is 18442 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 18442?
18442 is a semiprime: 2 × 9221, the product of two primes.